SU1211075A1 - Casting mould for manufacturing polymeric articles - Google Patents

Description

one

The invention relates to the processing of polymers and can be used for the manufacture of products with undercuts, such as rollers, coils, carcasses.

The aim of the invention is to improve the reliability of the removal of the sprues with increasing nesting shape.

Figure 1 shows the form in the closed position, a longitudinal section; figure 2 is a view of the sliding semi-matrix; in fig. 3 - section A-A in FIG. 2 (the form is in the open position); in fig. 4 is a view B in FIG. 3 (gating system),

The casting mold contains a gating plate 1 with a central sprue in the echoing 2, a spacing gating channel 3, a sliding semi-matrix 4 and 5 placed in the grooves on the base plate 6, an ejector system of gates, including ejection pits 7 and 8 and view of spring-loaded ejectors 9 installed in bushings TH, and pushers 11 for ejectors 9 which are installed in the ejection plates 7 and 8 with displacement relative to the sleeves 10 in the direction of movement of the half-matrix and by the amount of this movement e 6 is provided with openings 12 at the pushers 11. In one sliding on po- lumatrits example 5, the sleeve 10 fitted with collar 13 and grip 14 mi sprue raspolozhennnmi under divorce conductive runner 3.

Ejectors 15 products are fixed in the ejection plates 7 and 8,

The punches are installed in the gating plate 1. The central sleeve 16 is fixed in the half-matrix with a 5 pin.

Columns 17 for moving the split semi-matrices are fixed in litniko-

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plate 1. Support plate 6 through the intermediate plate 18 and support bars 19 is connected with the base 20. Shank 21 is fixed in

5 taps 7 and 8.

Tunnel inlet gating channels 22 are made in sleeves 23 installed in gating equipment 1, made with a yoke 24,

 О The proposed device, in comparison with the known, allows to reliably remove the sprues when increasing the shape of the mold, since the distributor sprue is made parallel to the forming cavity. In this case, the central ejector is not enough to remove the sprues. At the same time, the execution of the slots under the ejector, directly related to

20 pits of pushing, significantly weakens the base plate, since the pushers cannot be made with a small bore diameter.

25,

Casting form works as follows.

After injection of the polymer and the process, the mold opens 30

c, while after removing the punches of the semi-matrix 4 and 5, they are moved apart. The sprues extracted from the gutter channels are retained by the grips 14 on the surface of the semi-matrix 5. With columns 7, the sliding semi-matrices 4 and 5 are diluted until the ejectors 9 are aligned coaxially with the pusher 11.

As a result of interaction, the needles

In the case of an automatic thermoplastic maker 21, the ejection plates 7 and 8 are stopped, and the products and the sprues are removed by the ejector 15 and 9, respectively.

20

20

21

view 6

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Claims (1)

INJECTION FORM FOR MANUFACTURING POLYMERIC PRODUCTS, comprising a sprue plate with a central sprue sleeve and a distributing sprue channel, sliding half-matrixes placed in grooves on the base plate, and an ejection system of sprues, including sprue plates, characterized in that, in order to increase reliability, to increase reliability increasing mold nesting, one of the sliding half-matrices is equipped with bushings with sprue clamps, which are located under the distributing sprue channel, and the ejector system Nena as a spring-loaded ejector mounted in the sleeves and plungers for ejectors, which are mounted in plates ejection offset with respect to the bushings in the moving direction and the jaws on the magnitude of the displacement, wherein in the base plate is provided with holes for the pushers.